A. aequalis may refer to:

• Abra aequalis, a saltwater clam in the genus Abra
• Abrochia aequalis, a synonym of Pseudosphex aequalis, a moth found in Brazil
• Aediodes aequalis, a synonym of Piletocera aequalis, a moth found in New Guinea
• Aemene aequalis, a synonym of Eugoa aequalis, a moth found in Borneo, Malaysia, and Sumatra
• Aethalops aequalis, the Borneo fruit bat
• Agabus aequalis, a predaceous diving beetle found in Russia, China, and Mongolia
• Agrotis aequalis, a synonym of Euxoa aequalis, a moth found in Canada and the United States
• Alopecurus aequalis, a grass native to the temperate Northern Hemisphere
• Alpenus aequalis, a synonym of Alpenus maculosus, a moth found in Africa
• Apha aequalis, a moth found in Japan
• Aradus aequalis, a flat bug found in North America
• Astycus aequalis, a weevil found in Sri Lanka